No Audio via HDMI on U400

I got my new U400 a week ago. Today I tried to connect the laptop to my TV using HDMI.

but the audio does not play on the TV, I looked in few forums, which suggests that I need to switch the audio to Hi Definition Audio Controller, from the Control Panel->Sound->Playback.

I only see one audio playback device listed there (Conexant Smart Audio HD) which is my laptop speakers. I right tclicked on empty are and selected both disabled and disconnected devices, but no HDMI audio controller is listed.

Re: No Audio via HDMI on U400

tried all combinations but does not seem to help. the HDMI playback is never listed in the playback devices. I am confused, will it always be listed there or only displayed when the TV is connected to laptop.

Re: No Audio via HDMI on U400

I have tried but all the drivers are up to date. I have LG Lcd tv 720p relatively old, but it works well with all other internet capable devices. I am not sure what causes the digital hdmi display as one of the playback devices and Why its not listing in my laptop?

If I plugin HDMI to my TV Samsung Plasma PS50C450 I have not the sound. I was traied many types of settings and when to connetion, but the sound is only sometimes, when I connect other HDMI port on TV them before. But after disconect it is again lost.